Hitachi 60SDX88B: loses horizontal drive, then dies - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 3 Old 12-29-2012, 06:47 PM - Thread Starter
Newbie
 
CavemanJoe's Avatar
 
Join Date: Oct 2010
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Hey, folks! Pittsburgher here, got an old Hitachi 60SDX88B, wonderful set, very happy with it.

Lately, a problem has developed. The picture - all three colours - will shrink horizontally, appearing to "pulse" wide and short, and then once it passes a certain threshold the picture disappears and will not return until the set is powered off, left for a minute or so, then powered on again. After power-off, sometimes a rhythmic "tick" can be heard from the inside of the set, starting at about one tick per second and gradually slowing down. Sometimes the set will not turn back on again, and will give me that rhythmic tick instead - when this happens, the speakers are initialized (I can hear the thump as power is sent to them), but the picture tubes don't get any power (I can't hear the static "futz" that happens when the tube is energized).

The tick doesn't have the same quality as a relay clicking over, but I can't see any obvious arcing inside the set.

Looking inside, there are several green LED's which pulse simultaneously in time with the tick when it's present. No bulging caps, burn marks, or other obvious signs of trouble.

The service manual says to short the gate and cathode of a 400v thyristor, observe whether or not I get a picture, and go from there. My questions:

1. Should I short those pins while the set is running, or put some heavy wire in place and then turn on the set?
2. Does anyone with more experience have a better idea? I know these service manuals only talk in very broad generalities.
3. Am I bonkers for even trying this? The most dangerous thing I've done to this set so far has been replacing the convergence STK's.
4. Is anyone from Pittsburgh willing to have a go at this for some cash money?

Thanks! biggrin.gif

-CMJ
CavemanJoe is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 12-31-2012, 05:00 AM
AVS Addicted Member
 
videobruce's Avatar
 
Join Date: Dec 2002
Location: Buffalo NY
Posts: 15,316
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Liked: 160
Post the question in your local reception thread.

.
.
Abundant OTA television is what makes this country different from all others. Lets keep it this way. If you like Wi-Fi so much, OTA fits right in. After all, it is wireless.
videobruce is online now  
post #3 of 3 Old 02-24-2013, 08:30 PM - Thread Starter
Newbie
 
CavemanJoe's Avatar
 
Join Date: Oct 2010
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Dear people from Google with the same problem:

It was the flyback voltage regulator, part number STRM6811. It's behind the flyback, attached to a fairly chunky heatsink. Swapped that out, no problems since then. Good luck. smile.gif
CavemanJoe is offline  
Reply Rear Projection Units

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off